Unpacking on flow constructs (return/yield) now implies 3.8+ (#2700)

[etc/vim.git] / src / black / mode.py

diff --git a/src/black/mode.py b/src/black/mode.py
index e2417531240b7c38ae0a61d782a84f9cdf9ee7fd..b28dcd8d1494eee4c171b9a58a0f1faea29649e7 100644 (file)
--- a/src/black/mode.py
+++ b/src/black/mode.py
@@ -4,11 +4,18 @@ Mostly around Python language feature support per version and Black configuratio
 chosen by the user.
 """
 
+import sys
+
 from dataclasses import dataclass, field
 from enum import Enum
 from operator import attrgetter
 from typing import Dict, Set
 
+if sys.version_info < (3, 8):
+    from typing_extensions import Final
+else:
+    from typing import Final
+
 from black.const import DEFAULT_LINE_LENGTH
 
 
@@ -42,8 +49,12 @@ class Feature(Enum):
     POS_ONLY_ARGUMENTS = 9
     RELAXED_DECORATORS = 10
     PATTERN_MATCHING = 11
+    UNPACKING_ON_FLOW = 12
     FORCE_OPTIONAL_PARENTHESES = 50
 
+    # __future__ flags
+    FUTURE_ANNOTATIONS = 51
+
     # temporary for Python 2 deprecation
     PRINT_STMT = 200
     EXEC_STMT = 201
@@ -55,6 +66,11 @@ class Feature(Enum):
     BACKQUOTE_REPR = 207
 
 
+FUTURE_FLAG_TO_FEATURE: Final = {
+    "annotations": Feature.FUTURE_ANNOTATIONS,
+}
+
+
 VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
     TargetVersion.PY27: {
         Feature.ASYNC_IDENTIFIERS,
@@ -89,6 +105,7 @@ VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
         Feature.TRAILING_COMMA_IN_CALL,
         Feature.TRAILING_COMMA_IN_DEF,
         Feature.ASYNC_KEYWORDS,
+        Feature.FUTURE_ANNOTATIONS,
     },
     TargetVersion.PY38: {
         Feature.UNICODE_LITERALS,
@@ -97,8 +114,10 @@ VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
         Feature.TRAILING_COMMA_IN_CALL,
         Feature.TRAILING_COMMA_IN_DEF,
         Feature.ASYNC_KEYWORDS,
+        Feature.FUTURE_ANNOTATIONS,
         Feature.ASSIGNMENT_EXPRESSIONS,
         Feature.POS_ONLY_ARGUMENTS,
+        Feature.UNPACKING_ON_FLOW,
     },
     TargetVersion.PY39: {
         Feature.UNICODE_LITERALS,
@@ -107,9 +126,11 @@ VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
         Feature.TRAILING_COMMA_IN_CALL,
         Feature.TRAILING_COMMA_IN_DEF,
         Feature.ASYNC_KEYWORDS,
+        Feature.FUTURE_ANNOTATIONS,
         Feature.ASSIGNMENT_EXPRESSIONS,
         Feature.RELAXED_DECORATORS,
         Feature.POS_ONLY_ARGUMENTS,
+        Feature.UNPACKING_ON_FLOW,
     },
     TargetVersion.PY310: {
         Feature.UNICODE_LITERALS,
@@ -118,9 +139,11 @@ VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
         Feature.TRAILING_COMMA_IN_CALL,
         Feature.TRAILING_COMMA_IN_DEF,
         Feature.ASYNC_KEYWORDS,
+        Feature.FUTURE_ANNOTATIONS,
         Feature.ASSIGNMENT_EXPRESSIONS,
         Feature.RELAXED_DECORATORS,
         Feature.POS_ONLY_ARGUMENTS,
+        Feature.UNPACKING_ON_FLOW,
         Feature.PATTERN_MATCHING,
     },
 }